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how to choose a pv spacer

Joined
Apr 11, 2003
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#1
i have an 03' rm250 that i'm riding in the woods. i see a power valve spacer in 15mm and 7mm. what are the characteristics of each and how do you choose? also what effects will a 3mm pipe spacer do?
thanks,
jonathan
 

marcusgunby

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Joined
Jan 9, 2000
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#2
With all these mods in theory the bigger the vol or spacer the more bottom, and less top you have, however in reality it doesnt work like that, on the 04rm125 we tested a 4mm spacer for the pipe, this should have gave more bottom and less top, well all it did was loose overrev and it didnt gain any bottom at all.You get to a point where it doesnt give more than you have.How to get to that point is hard to say, i put mine on a dyno and test all the bits i have, or can borrow, to see what works, for me its the only way to know for sure.